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Allow transform of DS to wavelength grid #39

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mhvk opened this issue May 4, 2021 · 0 comments

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mhvk commented May 4, 2021 •

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Roughly, assuming an existing regular secondary spectrum ss made from a dynamic spectrum ds:

step1 = np.zeros_like(ss.secspec)
waveish = ds.f.mean()**2 / ds.f
ph = phasor(waveish, ss.tau[:, np.newaxis])  # not the conjugate!
for d, s in zip(ds.dynspec, step1):
    s[...] = (d * ph).sum(-1)
lt = np.fft.fftshift(np.fft.fft(step1, axis=0), axes=0)
lt /= np.abs(lt[lt.shape[0]//2, lt.shape[1]//2])
lt = SecondarySpectrum(lt, ss.fd, ss.tau, ss.noise, ss.d_eff, ss.mu_eff)

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